<form action="<?php echo site_url('usercp/updatePwd'); ?>" method="POST">
    <div>
        Password Lama
    </div>
    <div>
        <input type="password" name="pwdlama" />
    </div>
    <div>
        Password Baru
    </div>
    <div>
        <input type="password" name="pwdbaru" />
    </div>
    <div>
        <button type="submit">Ganti</button>
    </div>
</form>